Vitor Rolim
Universidade Federal Rural de Pernambuco
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Publication
Featured researches published by Vitor Rolim.
Revista De Saude Publica | 2014
Sandra Maria de Torres; Nadine Louise Nicolau da Cruz; Vitor Rolim; Maria Inês de Assis Cavalcanti; Leucio Câmara Alves; Valdemiro Amaro da Silva Junior
OBJECTIVE To evaluate the larvicidal activity of Azadirachta indica, Melaleuca alternifolia, carapa guianensis essential oils and fermented extract of Carica papaya against Aedes aegypti (Linnaeus, 1762) (Diptera: Culicidae). METHODS The larvicide test was performed in triplicate with 300 larvae for each experimental group using the third larval stage, which were exposed for 24h. The groups were: positive control with industrial larvicide (BTI) in concentrations of 0.37 ppm (PC1) and 0.06 ppm (PC2); treated with compounds of essential oils and fermented extract, 50.0% concentration (G1); treated with compounds of essential oils and fermented extract, 25.0% concentration (G2); treated with compounds of essential oils and fermented extract, 12.5% concentration (G3); and negative control group using water (NC1) and using dimethyl (NC2). The larvae were monitored every 60 min using direct visualization. RESULTS No mortality occurred in experimental groups NC1 and NC2 in the 24h exposure period, whereas there was 100% mortality in the PC1 and PC2 groups compared to NC1 and NC2. Mortality rates of 65.0%, 50.0% and 78.0% were observed in the groups G1, G2 and G3 respectively, compared with NC1 and NC2. CONCLUSIONS The association between three essential oils from Azadirachta indica, Melaleuca alternifolia, Carapa guianensis and fermented extract of Carica papaya was efficient at all concentrations. Therefore, it can be used in Aedes aegypti Liverpool third larvae stage control programs.
artificial intelligence in education | 2018
Rafael Ferreira; Vitomir Kovanović; Dragan Gasevic; Vitor Rolim
This paper presents a novel method for the evaluation of students’ use of asynchronous discussions in online learning environments. In particular, the paper shows how students’ cognitive development across different course topics can be examined using the combination of natural language processing and graph-based analysis techniques. Drawing on the theoretical foundation of the community of inquiry model, we show how topic modeling and epistemic network analysis can provide qualitatively new insight into students’ development of critical and deep thinking skills. We also show how the same method can be used to investigate the effectiveness of instructional interventions and its effect on student learning. The results of this study and its practical implications are further discussed.
EC-TEL | 2018
Valter Neto; Vitor Rolim; Rafael Ferreira; Vitomir Kovanović; Dragan Gasevic; Rafael Dueire Lins; Rodrigo Lins
This paper presents a method for automated content analysis of students’ messages in asynchronous discussions written in Portuguese. In particular, the paper looks at the problem of coding discussion transcripts for the levels of cognitive presence, a key construct in a widely used Community of Inquiry model of online learning. Although there are techniques to coding for cognitive presence in the English language, the literature is still poor in methods for others languages, such as Portuguese. The proposed method uses a set of 87 different features to create a random forest classifier to automatically extract the cognitive phases. The model developed reached Cohen’s \(\kappa \) of .72, which represents a “substantial” agreement, and it is above the Cohen’s \(\kappa \) threshold of .70, commonly used in the literature for determining a reliable quantitative content analysis. This paper also provides some theoretical insights into the nature of cognitive presence by looking at the classification features that were most relevant for distinguishing between the different phases of cognitive presence.
Arquivo Brasileiro De Medicina Veterinaria E Zootecnia | 2018
Luana Thamires Rapôso da Silva; J.S.A. Silva; Débora Costa Viegas de Lima; Vitor Rolim; M.F.V. Marvulo; J.C.R. Silva; Rinaldo Aparecido Mota; Andréa Alice da Fonseca Oliveira
Arquivo Brasileiro De Medicina Veterinaria E Zootecnia | 2018
Luana Thamires Rapôso da Silva; J.S.A. Silva; R.F.S. Regueira; Vitor Rolim; Mércia R. Barros; Andréa Alice da Fonseca Oliveira
VI Congresso Brasileiro de Informática na Educação | 2017
Vitor Rolim; Rafael Ferreira; Evandro Costa; Anderson Cavalcanti; Máverick Dionísio
Revista Brasileira de Informática na Educação | 2017
Vitor Rolim; Rafael Ferreira; Evandro Costa
Brazilian Symposium on Computers in Education (Simpósio Brasileiro de Informática na Educação - SBIE) | 2016
Vitor Rolim; Rafael Ferreira; Evandro Costa
Anais dos Workshops do Congresso Brasileiro de Informática na Educação | 2016
Vitor Rolim; Rafael Ferreira; Evandro Costa
Ciência Veterinária nos Trópicos | 2015
L. T. R. da Silva; Vitor Rolim; J. S. de Alcântara e Silva; G. de M. Silva; R. A. Mota; A. A. F. Oliveira
Collaboration
Dive into the Vitor Rolim's collaboration.
Andréa Alice da Fonseca Oliveira
Universidade Federal Rural de Pernambuco
View shared research outputsLuana Thamires Rapôso da Silva
Universidade Federal Rural de Pernambuco
View shared research outputs